Blowpipe



J. HARRIS.

BLOWPIPE.

APPLICATION FILED AUG-26,1918.

1 A%% 1 63., Patented Aug. 1, 1922.

entree PATENT? FQHN HARRIS, 01E LAKEWOOD, OHIO, ASSIGNOR F ONE-HAZE TOJAMES R. ROSE, 0F EDGEWORTH, PENNSYLVANIA.

BLOWPIPE.

Application filed August 26, 1918.

To all whom it may concern Be it known that I, JoHN HARRIS, a citizen orthe United States, residing at Lakewood, in the county of Cuyahoga andState of Ohio, have invented a certain new and useful Improvement inBlowpipes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to blow-pipes such as are employed in the art ofcutting and welding metals with gases. The objects of the invention arethe provision of a blow pipe which shall be particularly simple andeconomical to construct and convenient to use; which will not back-fireor snap back; the provision of ablow pipe tip which can be readilymanufactured, which shall be absolutely symmetrical and which can bereadily and conveniently cleaned; while further objects and advantagesof my said invention will become apparent as this description proceeds.

In the drawings accompanying and forming a part of this application, Ihave shown certain embodiments of my said invention although it will beunderstood that the same constitute only a few out of the great numberof mechanical forms in which my inventive idea may be utilized. In thesedrawings Fig. l is a side elevation of a complete blow-pipe constructedin accordance with my invention; Fig. 2 is a longitudinal sec-' tionalview through the blow-pipe head and tip; Fig. 3 is a perspective View ofthe tipcore; Figs. 4c and 5 are sectional views corresponding to thelines 4-4 and 55 respectively of Fig. 2; and Figs. 6 and 7 are similarsectional views illustrating modified forms of tip construction.

Describing by reference characters the various parts herein illustrated,1 represents the tail member and 2 the head member of a standardmetal-cutting blow pipe, the same being connected by three paralleltubes 3, 4e, and 5, thefirst being the conduit for the cutting oxygen,the second that for reheating oxygen, and the third that for thecombustible gas. Carried by the tail member 1 is a supply connection 6for oxygen, to which may be connected the oxygen supply-pipe 7, andwhich communicates with the pipes 3 and 4 by suitable passageways (notshown); Also carried by the tail piece 1 is a second connection 8adapted for the Specification of Letters Patent.

Patented Aug. 1, 1922. serial No. 251,409.

reception of the flexible pipe 9 leading to the gas supply, andcommunicating with the pipe 5 by a passageway (not shown). The

three pipes are here shown surrounded b the hollow shell 10 constitutinga handle for the torch. The conduit 3 at some point in its length isprovided with a quick opening valve 11 of the usual or any suitabletype, controlled by a lever 12 which projects into convenient operativerelation with the shell 10. The conduit 4 is controlled by a stop cook13 and the conduit 5 by the stop-cock 14, both carried by the tailmember 1.

The head 2 is formed 16, and 17 communicating respectively with theconduits 3, 41, and 5. The passageway connects with the chamber 18 fromwhich leads the oxygen-passageway 19 preferably coaxial of the tip, theouter portion of this passageway being enlarged and threaded as shown at20. Beyond this threaded portion the head is enlarged yet further asshown at 21, constituting a receiving socket and mixing chamber.

The rearward portion of the head, out of alignment with the passageway15 and chamber 18, is formed with a threaded opening 24: whichintersects the passages 16 and 17, and whose inner end communicates withthe chamber 21 by means of an axial bore 25. Threaded in the outerportion of this I opening is the plug 26 whose inner end is exteriorlyenlarged so as to fill the opening between the passageways 16 and 17 andis formed interiorly with a bore 28 communieating with the passageway16. The inner end of said plug is tapered and this tapered end extendsacross the passageway 17 forming an injector of a well'known type.

The tip is made in two parts, a core and a shell, which are formedindependently and subsequently assembled together. The core or innermember comprises a plug having throughout the "major portion of itslength a central axial bore 30 of the same diameter as and adapted toregister with the passageway 19. At its lower end the bore 30 is reducedto form a restricted orifice 31 which merges into the larger bore bymeans of an inclined or tapered passage 32 to facilitate the even flowof the gas from the larger to the restricted portion of the centralbore. At its upper end, the exterior of this core is provided with athread 33 adapted to engage the socket 20, and with with passageway 15,

I the passages 45 a seating portion 34E of any suitable or desiredtypeadapted to make and maintain a gas tight joint at this point. Belowthe threaded portion 33 the plug is made of cylindrical shape as shownat 35, the sides thereof-being flattened as shown at 36 or otherwisegrooved to form This portion is succeeded by a reduced cylindricalportion 37, and this again in turn by a frusto-pyramidal' portion 38,characterized by the possession of a plurality of fiat inclined sides 39defined by tapering passageways.

- edges 40 which terminate at the end of the tip. i The shell of the tipconsists of a metal tube ail-having a cylindrical portion of an interiorsize adapted to receive snugly the cylindrical portion 35 of the coreand having an external diameter such as to fit snugly within the outerend of the chamber 21. The lower extremity of this shell is tapered bothinteriorly and exteriorly as shown at 43, the inner wall at this pointpreferably making an angle of approximately four and one'half degreeswith the axis of the same, as described and claimed in my application#225,431, filed March 29, 1918, although for purpose of the presentinvention ll do not limit myself thereto. The inclinationof the faces 39of the core is such as to bring the edges 40-40 into close juxtapositionwith inner wall of this shell thus forming a number of symmetricallyarranged narrow equal in number to the sides of the core. The parts ofthe tip are preferably held together by means ofone or more suitablepins 16 traversing the shell and the cylindrical portion of the core,and the entire core is held in the head by the engagement of the thread33 with the socket 20. A gland nut 47 is preferably screwed upon theexterior of the head and embraces the tip, being provided with packing18 so as to prevent any possible leakage.

The valve 11 is closed excepting when the handle 12 is depressed; and inthe normal use of the pipe the stop cocks 13 and Marc so adjusted thatthe oxygen entering into the pipe 4 will aspirate the gas through theconduit 5 to make a strongly burning mixture which is first commingledin the empty f bottom portion of the chamber 21 whence it asses alongthe fiat sides of the tip core 'to the distributing channel 37 whenceit.

issues from the tip by way of the fiat-walled channels e5. Upon pressingthe lever 12 an additional jet of oxygen under compar a tively highpressure is caused to issue through the ax al opening 31, but withoutany appreciable change in the amount of gas passing around the, exteriorof the tip core.

The two main operating defects in this class of devices have generallybeen either a blowing out of the flame by the rush of oxygen through thecentral bore or a snaponly by the prior art and the claims iaaaieeping-back of the flame into the sidepassages, which might occur at anytime. The former detect can be overcome by setting the side passagesat-exactly the right angle, which is very easily done with the presentconstruction, since the prismatic faces can be milled with greataccuracy, whereas the bored apertures heretofore employed cannot be madewith exactness. Also the snappingback is eliminated since the wide andshallow passageways are not well suited to the propagation or. flameowing to the cooling effect produced by the spreading of the gaseousmixture into sheets which efiectively cool the walls of the tip membersbelow the point at which flame will be propagated through v thepassages.

The number 'of'faces can be varied very widely within my invention. Ihave shown three, four" and five and employ the same in practice indifferent sized blow pipes, taking care always to make the width of thepassageways so small as to prevent the propagation of fiame therealong,and securing larger gas capacity by increasing the number of passages.

It will be noted that the shell consists 0115 a plain. metal tubeentirely devoid ofthreads or other irregular portions. It is secured inplace solely by its attachment to the core, the latter being also of avery simple shape. As a result the structure is very inexpensive and canbe cheaply replaced when dostroyed by inadvertence on the part of theworkmen as very frequently occurs in such devices.

It will be understood that the conformation of the sides 36 has nonecessary connection with that of the sides 39, and in general thatgreat changes can be made within the scope of my invention whichis-limited hereto annexed.

Having thus described my invention what I claim is 1. A tip forblowpipes comprising a core member having a bore therethrough' and anexternal circumferential groove, the portion of said core at one side ofsaid groove being frusto-pyramidal and the portion at the i said bore,in combination with a shell having a frusto-conical portion closelyembracing the first mentioned portion of said core and a cylindricalportion closely embracing the second mentioned portion of said core.

2. In a blow pipe tip, a core having at one end a frusto-pyramidalportion and at the other end a screw thread, in combination with ahollow unthread d shell rigidly attached to said core and closelyembracing the frusto-pyramidal portion and terminating short of saidscrew thread.

3. In a blow pipe, acore-"havinga frustopyramidal. portion and acylindrical portion separated by an external circumferential groove,said cylindrical portion having passageways extending longitudinallythereof, in combination with a shell having a cylindrical portionsecured to and snugly embracing the cylindrical portion of the core anda tapered portion embracing the frustopyramidal portion of the core.

4. In a blowpipe tip, a longitudinal bored core having in succession athreaded portion, a cylindrical portion, a groove, and a the threadedend of said core, passageways being provided along the core from saidgroove to the end of said shell nearest the threads.

5. In a blowpipe, in combination, a head having a cylindrical socket, acore projecting axially through said socket, said core having a centralbore and external flattened portions, and a shell surrounding andcarried by said core and defining with such flattened portions aplurality of narrow pas sageways for gas, said shell comprising a plaintube part of which is cylindricalto fit into said socket and part ofwhich is tapered to produce a narrow point.

In testimony whereof, I hereunto aiiiX my signature.

' JOHN HARRIS,

